Namesakes
Fictional Characters from Books:
1 character
John Willoughby 1811 Sense and Sensibility 
Notable Actors and Entertainers:
1 presenter
Holly Willoughby 1981-
Olympic Medalists:
1 silver
(silver) Sam Willoughby 2012 cycling - BMX
Shakespearian Characters:
1 character
Lord William Willoughby Richard II